The computer power supply unit (PSU) is the device that supplies power to the other components in the PC.
It converts the mains alternating current (AC) to usable low voltage direct current (DC) for the internal components of the computer.
Some PSUs have a switch to select between 230 and 115 volts depending on your location in the world while others have automatic sensing.
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There are various types of PSUs of which the ATX form factor is the most popular. This form factor allows different power supplies to be interchangeable with different components inside the PC.
ATX computer power supplies (PSUs) are the switching types that are turned on and off by signals from the motherboard. This feature enables the standby mode present in most computers.
The present ATX standard is now ATX Ver.2.31. Power supplies are rated based on their maximum power output. These devices typically output power in the ranges of 350 watts to 500 watts for small form factor PCs, 550 watts to 700 watts for medium range PCs and for extreme gaming and multimedia PCs, 750 up to 1400 watts.
CAUTION! - It is never recommended to repair a power supply since it does not contain user-serviceable parts. Repairing power supplies can be dangerous and hazardous.Never open it to repair it because it stores electricity even when the computer is turned off and unplugged!
Below are some of the main connectors of a power supply unit:
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